[FFmpeg-devel] [PATCH 1/2] doc/ffmpeg: update the documentation about qsv device creation

["Xiang, Haihao" <haihao.xiang-at-intel.com@ffmpeg.org>]

From: Haihao Xiang <haihao.xiang@intel.com>

Signed-off-by: Haihao Xiang <haihao.xiang@intel.com>
---
 doc/ffmpeg.texi | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi
index ab17d1d687..c6c0606e8a 100644
--- a/doc/ffmpeg.texi
+++ b/doc/ffmpeg.texi
@@ -1406,16 +1406,33 @@ If not specified, @samp{auto_any} is used.
 platform-appropriate subdevice (@samp{dxva2} or @samp{d3d11va} or @samp{vaapi}) and then deriving a
 QSV device from that.)
 
-Alternatively, @samp{child_device_type} helps to choose platform-appropriate subdevice type.
-On Windows @samp{d3d11va} is used as default subdevice type.
+The following options are recognized:
+@table @option
+@item child_device
+Specify a DRM render node on Linux or DirectX adapter on Windows
+@item child_device_type
+Choose platform-appropriate subdevice type. On Windows @samp{d3d11va} is used
+as default subdevice type.
+@end table
 
 Examples:
 @table @emph
+@item -init_hw_device qsv:hw,child_device=/dev/dri/renderD129
+Create a QSV device with @samp{MFX_IMPL_HARDWARE} on DRM render node /dev/dri/renderD129
+
+@item -init_hw_device qsv:hw,child_device=1
+Create a QSV device with @samp{MFX_IMPL_HARDWARE} on DirectX adapter 1. The subdevice
+type is @samp{d3d11va} if @code{--enable-libvpl} is specified at configuration time, the
+subdevice type is @samp{dxva2} if @code{--enable-libmfx} is specified at configuration time.
+
 @item -init_hw_device qsv:hw,child_device_type=d3d11va
 Choose the GPU subdevice with type @samp{d3d11va} and create QSV device with @samp{MFX_IMPL_HARDWARE}.
 
 @item -init_hw_device qsv:hw,child_device_type=dxva2
 Choose the GPU subdevice with type @samp{dxva2} and create QSV device with @samp{MFX_IMPL_HARDWARE}.
+
+@item -init_hw_device qsv:hw,child_device=1,child_device_type=d3d11va
+Create a QSV device with @samp{MFX_IMPL_HARDWARE} on DirectX adapter 1 with subdevice type @samp{d3d11va}
 @end table
 
 @item opencl
-- 
2.34.1

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